//
//   Copyright (c) 2009 Bálint Jánvári
//       www.programmaticmagic.com
//  
//  Permission is hereby granted, free of charge, to any person
//  obtaining a copy of this software and associated documentation
//  files (the "Software"), to deal in the Software without
//  restriction, including without limitation the rights to use,
//  copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the
//  Software is furnished to do so, subject to the following
//  conditions:
//
//  The above copyright notice and this permission notice shall be
//  included in all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
//  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
//  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
//  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
//  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
//  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
//  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
//  OTHER DEALINGS IN THE SOFTWARE.

//
//  OMConnectivity.m
//  ObjectiveMagic
//

#import "OMConnectivity.h"
#import <SystemConfiguration/SCNetworkReachability.h>
#import <netinet/in.h>

BOOL OMConnectivityIsConnected()
{
	/*
	 This function is not my work.
	 Of the pieces of code I found floating around the internet,
	 this is by far the most relieable way to determine connectivity.
	 There might be a way to simplify it, but this has never failed me,
	 so I didn't change it.
	 */
    // Create zero addy
    struct sockaddr_in zeroAddress;
    bzero(&zeroAddress, sizeof(zeroAddress));
    zeroAddress.sin_len = sizeof(zeroAddress);
    zeroAddress.sin_family = AF_INET;
	
    // Recover reachability flags
    SCNetworkReachabilityRef defaultRouteReachability = SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr *)&zeroAddress);
    SCNetworkReachabilityFlags flags;
	
    BOOL didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);
    CFRelease(defaultRouteReachability);
	
    if (!didRetrieveFlags)
    {
        printf("Error. Could not recover network reachability flags\n");
        return 0;
    }
	
    BOOL isReachable = flags & kSCNetworkFlagsReachable;
    BOOL needsConnection = flags & kSCNetworkFlagsConnectionRequired;
	BOOL nonWiFi = flags & kSCNetworkReachabilityFlagsTransientConnection;
	return ((isReachable && !needsConnection) || nonWiFi) ? 
	(([[NSURLConnection alloc] initWithRequest:[NSURLRequest 
												requestWithURL: [NSURL URLWithString:@"http://www.youtube.com/robots.txt"] 
												cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:15.0] 
									  delegate:nil]) ? YES : NO) : NO;
}